Ngwa ngwaahịa:
A na-eji bọọdụ PP (polypropylene) dị ọcha nke 8mm gbara ọkpụrụkpụ, nke siri ike.
acid na alkali eguzogide, na nkwonkwo na-mere nke ọkachamara ntuziaka enweghị nkebi ịgbado ọkụ na
otu mkpanaka agba ịgbado ọkụ, acid siri ike, nguzogide mmetụta, enweghị corrosion, enweghị nchara.